OSX.FakeFileOpener

Short bio
OSX.FakeFileOpener is Malwarebytes’ detection name for malware that advertises PUPs and targets MacOS systems.
Type and source of infection
fake “no app for this file-type” dialog
OSX.FakeFileOpener is distributed by the same websites that also promote the “system optimizers” by scaring users into thinking their system is infected.

scareware site